THE UROGENITAL SYSTEM. 257 



passes from its ventral wall to the linea alba and is the suspen- 

 sory ligament. Two others pass one from each side of the 

 bladder to the dorsal body wall at the sides of the rectum. 

 They are the lateral ligaments of the bladder. They form the 

 walls of a partly isolated peritoneal pocket into which the 

 rectum passes; this pocket opens craniad into the peritoneal 

 cavaty. The wall of the bladder is composed of an internal 

 epithelium, a layer of plain muscle-fibre bundles which cross 

 one another in various directions, and the external peritoneal 

 layer. 



Suprarenal Bodies. Glandul/e suprarenales. — 

 The suprarenal bodies are two ovoid bodies about a centimeter 

 in the longest diameter, lying craniomediad of the kidneys, but 

 usually not touching them. In a fresh condition they are of a 

 pinkish or yellow color. They are usually imbedded in fat and 

 are covered by peritoneum on their ventral surface. They have 

 no duct and are of uncertain function. 



2. The Genital Organs. 



A. The Male Genital Organs. External Genital 

 Organs. — The external genital organs are the scrotum and 

 penis. 



The scrotal sac or scrotum is a pouch of integument which 

 lies ventrad of the anus in the median line against the ischiatic 

 symphysis. It is marked by a median groove which indicates 

 the position of an internal septum dividing its cavity into lateral 

 halves, within each of which is one of the testes. 



The penis (Fig. in,/; Fig. 113, 6; see also page 262) lies 

 ventrad of the scrotal sac. It projects caudad. It is covered 

 by the integument, which projects at its end as a free fold, the 

 prepuce. Within the prepuce is the projecting glans penis 

 (Fig. 1 13, 7). It is conical and bears on the ventral side of its 

 free end the opening of the urethra, the common urinogenital 

 opening. On the side on which the urethra opens the glans is 

 connected to the prepuce by a fold of integument, the frenu- 

 lum. The surface of the glans is covered with sharp, recurved, 

 horny papillae. 



